US3609047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single beam photometer system wherein the absorbance of a sample is determined relative to a reference
Assignee: Xerox Corp
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Filing: 1970-03-02
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Granted: 1971-09-28
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Expires: 1990-03-02
Abstract
Abstract A single beam photometer system for measuring the differential optical absorbance of a sample with respect to a reference. The sample and the reference are held in a two compartment container. A rotating transport wheel driven by a stepping motor is utilized to move the container so as to pass the sample and the reference through a light beam in succession. The intensity of the light transmitted through the sample and the reference is measured by a photocell. The output from the photocell is fed into an electronic system which produces an output signal corresponding to the differential optical absorbance of the sample with respect to the reference.
Inventors
- 👤 Douglas G Marlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/17; G01N21/25; G01N21/251; G01N21/253; G01N21/27; G01N21/274; G01N21/276
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A single beam photometer system for measuring the differential optical absorption of a sample relative to a reference comprising: means for projecting a beam of monochromatic light along a fixed path; a container having two compartments, one of said compartments for holding said sample and the other said compartment for holding the reference; transport means for transporting said container so as to move said sample and said reference in said beam path in rapid succession, said transport means including a rotatable transport wheel for holding said container and a stepping motor operatively connected to said transport wheel for driving said transport wheel; a light detector for measuring the intensity of the light transmitted through said sample and said reference and producing a separate electrical signal corresponding to each of said intensities; and electronic means for processing said two signals and producing an output signal corresponding to the difference in the logarithm of said signals, said output signal corresponding to the differential optical absorbance of said sample relative to said reference.
Claim 2
Dependent Claim
42 words
The system according to claim 2 and wherein said means for projecting a beam of monochromatic light comprises a chromatic light source for projectIng a beam of chromatic light along a fixed path and a wavelength selector disposed along said beam path.
Claim 3
Dependent Claim
30 words
The system according to claim 2 and wherein the stepping motor is designed to provide a moving period of about 0.5 seconds and a dwell period of about 0.5 seconds.
Claim 4
Dependent Claim
29 words
The system according to claim 4 and wherein the two compartments of the container are successively interposed in the light beam during successive dwell periods of the stepping motor.
Claim 5
Dependent Claim
29 words
The system according to claim 2 and wherein the total time interval during which successive compartments of a container are interposed in the light beam is about 1.5 seconds.
Claim 6
Dependent Claim
39 words
The system according to claim 2 and wherein the electronics includes an analog converter coupled to the light detector, an analog to digital converter coupled to the analog converter and a computer coupled to the analog to digital converter.
Claim 7
Dependent Claim
51 words
The system according to claim 2 and further including a quantity of fluid having an index of refraction approximately equal to the sample and the reference surrounding the container so as to prevent any relative lateral shifting of the light beam as it passes through the two compartments of the container.
References Cited (Backward Citations)
US3551062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |